downgrading asset mapper to avoid regex bug

Author: weaverryan

ux.symfony.com/composer.json

@@ -17,7 +17,7 @@
         "league/commonmark": "^2.4",
         "pagerfanta/twig": "^3.8",
         "symfony/asset": "6.4.*",
-        "symfony/asset-mapper": "6.4.*",
+        "symfony/asset-mapper": "6.4.3",
         "symfony/console": "6.4.*",
         "symfony/dotenv": "6.4.*",
         "symfony/expression-language": "6.4.*",